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Date and Time Data Types
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No type of data provides more controversy than storing dates and times. Some applications need to store only a date. Some applications need to store only a time. Other applications need to store both dates and times together. Unfortunately, SQL Server stores this type of data together only as both a date and a time (for example, 2006-03-14 20:53:36.153, which is the precise millisecond on the system clock when this sentence was started). Data Type datetime Storage 8 bytes Value Range January 1, 1753 through December 31, 9999 with an accuracy of 3.33 milliseconds January 1, 1900 through June 6, 2079 with an accuracy of 1 minute Purpose Stores large date and time values
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smalldatetime
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4 bytes
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Stores a smaller range of date and time values
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The datetime and smalldatetime data types are stored internally as integers. The datetime type is stored as a pair of 4-byte integers that together represent the number of milliseconds since midnight on January 1, 1753. The first 4 bytes store the date, and the second 4 bytes store the time. The smalldatetime type is stored as a pair of 2 byte integers that together represent the number of minutes since midnight on Janu ary 1, 1900. The first 2 bytes store the date, and the second 2 bytes store the time.
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To store character data, you can select one of the data types designed for this purpose. Each one consumes either 1 or 2 bytes of storage for each character.
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Lesson 1: Designing Database Tables
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There are a wide variety of languages active in the world, so a method was needed to store the variety of characters in a standard format. The American National Standards Institute (ANSI) standards body defined an encoding stan dard that required 8 bits to represent the range of letters. The only problem was that every character could not be specified within a single 8-bit encoding. So dozens of character sets were created that defined the acceptable characters for a given encoding. This worked well until data was transferred between systems using different character sets. If a character in one encoding did not exist in a dif ferent encoding, it was lost in the translation process. Along with the issues with encoding translation, there are also several languages in the world that cannot be captured within an 8-bit encoding. So a Unicode standard was created, which uses 2 bytes to represent each character. Because of the extra space, all the character sets in use in the ANSI standard were elim inated. Each unique character could now be expressed within a single encod ing schema. Because a single encoding schema is used for Unicode, no encoding translation is necessary when transferring data between systems set for different languages (this allows character data to be completely transport able). The only downside is that Unicode data types require 2 bytes to store each character, so Unicode data types stores one-half as many characters as their ANSI counterparts. The Unicode data types are preceded with an n. For example, nchar is the Uni code counterpart to the char data type, which uses the ANSI encoding. When defining a character data type, you specify the maximum number of bytes the column is allowed to store. For example, a char(10) can store a maximum of 10 characters because each character requires 1 byte of storage, whereas an nchar(10) can store a maximum of only 5 characters because each Unicode char acter requires 2 bytes of storage.
Data Type char(n)
Storage 1 to 8000 bytes
Number of Char acters Maximum of 8000 characters
Purpose ANSI data type that is fixed width
12
Designing the Physical Database
Data Type nchar(n) varchar(n) varchar(max) nvarchar(n) nvarchar(max) text ntext
Storage 2 to 8000 bytes 1 to 8000 bytes Up to 2 GB 2 to 8000 bytes Up to 2 GB Up to 2 GB Up to 2 GB
Number of Char acters Maximum of 4000 characters Maximum of 8000 characters Up to 1073741824 characters Maximum of 4000 characters Up to 536870912 characters Up to 1073741824 characters Up to 536870912 characters
Purpose Unicode data type that is fixed width ANSI data type that is vari able width ANSI data type that is vari able width Unicode data type that is variable width Unicode data type that is variable width ANSI data type that is vari able width Unicode data type that is variable width
Why are there so many data types to store characters that appear to be equivalent to each other A char data type, either ANSI or Unicode, is a fixed-width data type, so it consumes the same amount of storage space regardless of the number of characters you store in the column. For example, a char(30) column consumes 30 bytes of stor age space regardless of whether you store 1 character or 30 characters in the column. Any unused space is padded with spaces up to the maximum storage defined for the column. However, a varchar(30) column consumes 1 byte for each character that is stored in the column. The text and ntext data types are designed to store large amounts of character-based data. However, many operations are not allowed with text and ntext columns. For example, you cannot use them with an equality operator or joined together. A large number of system functions cannot be used with text and ntext data types.
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